Bundle sphinx/pycode/Grammar-*.pickle (ref: #2765)

So far, sphinx generates the grammar files on demand.
It causes uninstallation does not remove whole of files.
With this fix, Sphinx bundles the files in the package.

setup.py

@@ -6,6 +6,7 @@ import sys
 from distutils import log
 
 import sphinx
+from sphinx.pycode.pgen2.driver import compile_grammar
 
 long_desc = '''
 Sphinx is a tool that makes it easy to create intelligent and beautiful
@@ -72,6 +73,10 @@ extras_require = {
 if sys.platform == 'win32':
     requires.append('colorama>=0.3.5')
 
+# Compile grammars before packaging
+compile_grammar('sphinx/pycode/Grammar-py2.txt')
+compile_grammar('sphinx/pycode/Grammar-py3.txt')
+
 # Provide a "compile_catalog" command that also creates the translated
 # JavaScript files if Babel is available.